You can play the PC and Mac versions of Portal 2 two days before launch in UK shops by buying it from Steam.

The release is the result of an alternate reality game that culminated only a few hours ago. Valve has rewarded those who found all 36 potatoes hidden within the Portal 2 ARG with a free copy of the entire Valve Pack on Steam – which includes Portal 2.

UK shops such as GAME still have the first-person puzzler down for release on Thursday 21st April.

Eurogamer's Portal 2 review is live.

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Wesley Yin-Poole

Wesley Yin-Poole

Deputy Editor

Wesley is Eurogamer's deputy editor. He likes news, interviews, and more news. He also likes Street Fighter more than anyone can get him to shut up about it.

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